RCU Forums - View Single Post - My Advanced Realistic Humanoid Robots Project
Old 01-20-2026 | 11:39 AM
  #49  
Artbyrobot
Member
 
Joined: Feb 2025
Posts: 65
Likes: 0
Received 13 Likes on 13 Posts
Default

Ok so I was thinking now that each half bridge is just a tiny IC rather than a pair of hefty power mosfets, the space taken up overall by my entire bldc motor controller is going to be about 3cm x 1cm x 2mm which is insanely small for 30a continuous at 8v motor controller! This realization caused me to reconsider whether I even need to treat this as a single motor controller cluster that has to be sat like a horse saddle onto the side of my bldc motor - my original intention for my discrete components original design for my original bldc motor controller. What I realized instead is that things are now so small that I can simply build a half bridge for each phase as a inline element nested inside the cable run leading to each phase wire of the bldc motor. So instead of having a dedicated spot for each motor controller, I'm going to have just a slight bulge in the phase wire leading out from the bldc motor and that bulge will contain the half bridge that handles that phase wire. All nested inline. This is the easiest way to implement and most streamlined I think. It also means the whole motor controller will just be "floating" in midair, not actually mounted to any motor or anything at all. Just part of the wire harness nested right in there. This is a radical approach IMO. Only made reasonable by the fact we miniaturized the design by such an insane degree.



So the previous version of the schematic was intended to be mounted to the side of the motor like a horse saddle and had an l shape so inputs would come up from bottom and outputs out to left side toward motor phase wires. These L shaped half bridge setups would be stacked next to eachother side by side. In the new variation everything is inline, inputs coming from right and outputs exit out left side to motor.



Here's the updated inline variation of the schematic (no longer L shaped flow like before).





Last edited by Artbyrobot; 01-20-2026 at 11:51 AM.
The following users liked this post:
bisco (01-20-2026)